Date: 19 November 2018
Dataset:
November 8-16, 2018; tweets mentioning Nordstrom (and variations).
Purpose:
The DA team recently attended an R conference, which featured several talks on Text Mining and Sentiment analysis, including one from the author of the tidytext package. We wanted to take what we learned and apply it with regard to Nordstrom and how the company is discussed in the Twitter-verse.
Methodology:
Using the rtweet package, we pulled the maximum number of recent records mentioning Nordstrom (and all relevant variations – #nordstrom, @nordstrom, etc.), including re-tweets.
Results:
The following is meant to be a demonstration of the various types of text analyses that can be done with text mining and R.
First off, we used the tidytext package to separate each tweet by word, eliminate non-meaningful words (AKA “stop words”), and join words to the “Bing” sentiment lexicon. Note that “Bing” is binary – words are classified as either “Positive” or “Negative.”
nstrom_tweets_clean <- nstrom_tweets_day %>%
unnest_tokens(word, stripped_text) %>%
anti_join(stop_words) %>%
dplyr::mutate(tweet_day = as.integer(tweet_day)) %>%
dplyr::filter(!tweet_day %in% c(6, 7))
#update lexicon
nstrom_sent_bing <- nstrom_tweets_clean %>%
inner_join(get_sentiments("bing")) %>%
dplyr::filter(!tweet_day %in% c(6, 7))
nstrom_sent_bing = nstrom_sent_bing %>%
dplyr::group_by(tweet_day, sentiment, word) %>%
dplyr::summarize(n = length(word)) %>%
dplyr::ungroup() %>%
dplyr::arrange(desc(n)) %>%
dplyr::mutate(tweet_day = as.integer(tweet_day))
plot_a = ggplot(nstrom_sent_bing, aes(x=reorder(sentiment, n),
y = n, ,
fill = sentiment,
text = paste("Date: November", tweet_day, ", 2018",
"<br>Sentiment:", sentiment,
"<br>Score:", n))) +
geom_bar(stat = "identity", position = "identity") +
facet_wrap(.~tweet_day) +
ylab("Word Count") +
xlab("Sentiment Counts by Day") +
scale_fill_brewer(palette = "Set2", name = "Sentiment", direction = -1) +
theme(axis.text.x = element_blank())
ggplotly(plot_a, tooltip = "text", width = 900, height = 550)
This seems clear enough. But what words are contributing to each sentiment?
x = nstrom_tweets_clean$word
nstrom_words <- x
nstrom_words <- data.frame(nstrom_words)
nstrom_words[] <- lapply(nstrom_words, as.character)
tibblez = nstrom_words %>%
dplyr::rename(word = nstrom_words) %>%
dplyr::group_by(word) %>%
dplyr::summarize(n = length(word)) %>%
dplyr::ungroup() %>%
dplyr::arrange(desc(n))
tibblefiltered = tibblez %>%
dplyr::filter(n > 1)
attach(tibblefiltered)
barsentiment <- tibblefiltered %>%
inner_join(get_sentiments("bing"), by = c("word"))
attach(barsentiment)
plot_c = barsentiment %>%
dplyr::count(sentiment, word, n=n) %>%
dplyr::ungroup() %>%
dplyr::filter(n >= 35) %>%
# filter(!word %in% ignore_words) %>%
# filter(word != "free") %>% #doesn't need to add to weight we don't know context
dplyr::mutate(n = ifelse(sentiment == "negative", -n, n)) %>%
dplyr::mutate(word = reorder(word, n)) %>%
ggplot(aes(word, n, fill = factor(sentiment),
text = paste("Word:", word,
"<br>Mentions:", n))) +
geom_bar(stat = "identity") +
scale_fill_brewer(palette = "Set2", name = "Sentiment", direction = -1) +
ylab("Contribution to sentiment") +
xlab("Words mentioned more than 30x") +
coord_flip()
ggplotly(plot_c, tooltip = "text", width = 900, height = 750)
Most of these words seem correctly applied to their sentiment, but a few stand out as ambiguous or misclassified:
We can remove them as neutral words (for now) and return to our charts showing sentiments by day.
nstrom_sent_bing2 = nstrom_sent_bing %>%
dplyr::filter(!word %in% c("fall", "trump", "free", "rack", "black", "puma", "credit", "money", "tree", "pop", "hit"))
plot_b = ggplot(nstrom_sent_bing2, aes(x=reorder(sentiment, n), y = n, group = 1,
text = paste("Date: November", tweet_day, ", 2018",
"<br>Sentiment:", sentiment,
"<br>Score:", n))) +
geom_bar(stat = "identity", position = "identity", aes(fill = sentiment)) +
facet_wrap(.~tweet_day) +
ylab("Word Count") +
xlab("Sentiment Counts by Day") +
scale_fill_brewer(palette = "Set2", direction = -1, name = "Sentiment") +
#scale_fill_brewer(palette = "Set2", name = "Sentiment", direction = -1) +
theme(axis.text.x = element_blank())
ggplotly(plot_b, tooltip = "text", width = 900, height = 550)
We can also use the “NRC” lexicon to track additional sentiments:
nstrom_sent_nrc <- nstrom_tweets_clean %>%
inner_join(get_sentiments("nrc")) %>%
dplyr::count(word, sentiment, sort = TRUE) %>%
dplyr::ungroup() %>%
dplyr::filter(!sentiment %in% c("positive")) %>%
dplyr::filter(!word %in% c("fall", "trump", "free", "rack", "black", "puma", "credit", "money", "tree", "pop", "hit"))
nstrom_nrc_counts = nstrom_sent_nrc %>%
dplyr::group_by(sentiment) %>%
dplyr::top_n(10) %>%
dplyr::ungroup() %>%
dplyr::mutate(word = reorder(word, n))
plot_d = ggplot(nstrom_nrc_counts, aes(x=reorder(word, n), y = n, fill = sentiment,
text = paste("Word:", word,
"<br>Sentiment:", sentiment,
"<br>Mentions:", n), group = 1)) +
geom_bar(stat = "identity") +
facet_wrap(.~sentiment, scales = "free_y", ncol = 3) +
ylab("Top 10 Words per Sentiment") +
xlab("") +
scale_fill_brewer(palette = "Paired", name = "Sentiment") +
coord_flip() +
theme(axis.text.x = element_blank())
ggplotly(plot_d, tooltip = "text", width = 900, height = 550)
Everyone loves a word cloud!
nstrom_cloud = nstrom_tweets_clean %>%
anti_join(stop_words) %>%
dplyr::ungroup() %>%
dplyr::filter(!word %in% c("fall", "trump", "free", "rack", "black", "puma", "credit", "money", "tree", "pop", "hit", "nordstrom")) %>%
dplyr::count(word) %>%
dplyr::filter(!word =="shipping") %>%
with(wordcloud(word, n, max.words = 100))

Term Frequency
We can look at term frequency by day. This just shows us that every day there are a few words that are used extremely frequently and many that are used infrequently, which intuitively makes sense.
#term frequency
day_words <- nstrom_tweets_clean %>%
dplyr::count(tweet_day, word, sort = TRUE) %>%
ungroup()
total_words <- day_words %>%
dplyr::group_by(tweet_day) %>%
dplyr::summarize(total = sum(n))
day_words <- left_join(day_words, total_words)
#let’s look at the distribution of n/total for each day, the number of times a word appears in a day divided by the total number of terms (words) in that day This is exactly what term frequency is.
plot_e = ggplot(day_words, aes(n/total, fill = factor(tweet_day),
text = paste("Date: November", tweet_day, ", 2018",
"<br>Rank:", n,
"<br>Unique Daily Words:", comma(total)))) +
geom_histogram() +
xlim(NA, 0.004) +
scale_fill_brewer(palette = "Paired", name = "Day in November 2018") +
theme(legend.position = "none") +
facet_wrap(~tweet_day, ncol = 3, scales = "free_y")
ggplotly(plot_e, tooltip = "text", width = 900, height = 550)
Zipf’s Law
Illustrating the relationship between the frequency that a word is used and its end rank with Zipf’s law (which states that the frequency that a word appears is inversely proportional to its rank).
FYI: George Zipf was a 20th century American linguist.
freq_by_rank <- day_words %>%
dplyr::group_by(tweet_day) %>%
dplyr::mutate(rank = row_number(),
`term frequency` = n/total)
freq_by_rank %>%
ggplot(aes(rank, `term frequency`,
color = factor(tweet_day))) +
geom_line(size = 0.5, alpha = 0.8, show.legend = FALSE) +
scale_color_brewer(palette = "Paired") +
scale_x_log10() +
scale_y_log10() +
ylab("term frequency")

The deviations at low rank mean that people who tweet about Nordstrom use a lower percentage of the most common words than what is expected.
Here is the same graph, but with an approximation of the slope:
# Let’s see what the exponent of the power law is for the middle section of the rank range.
rank_subset <- freq_by_rank %>%
dplyr::filter(rank < 500,
rank > 10)
# lm(log10(`term frequency`) ~ log10(rank), data = rank_subset)
freq_by_rank %>%
ggplot(aes(rank, `term frequency`, color = factor(tweet_day))) +
geom_abline(intercept = -1.1641, slope = -0.8522, color = "black", linetype = 2) +
scale_color_brewer(palette = "Paired") +
geom_line(size = 0.5, alpha = 0.8, show.legend = FALSE) +
scale_x_log10() +
scale_y_log10() +
ylab("term frequency")

TF IDF
The idea of tf-idf is to find the important words – words that stand out – by decreasing the weight for commonly used words and increasing the weight for words that are not used very much in a collection. Calculating tf-idf attempts to find the words that are important (i.e., common) in a text, but not too common.
November 8 - 16, 2018:
day_words2 <- day_words %>%
bind_tf_idf(word, tweet_day, n) %>%
dplyr::arrange(desc(tf_idf))
plot_day2 =
day_words2 %>%
dplyr::arrange(desc(tf_idf)) %>%
dplyr::mutate(word = factor(word, levels = rev(unique(word)))) %>%
dplyr::group_by(tweet_day) %>%
top_n(10) %>%
ungroup %>%
ggplot(aes(word, tf_idf, fill = factor(tweet_day),
text = paste("Word:", word,
"<br>TF IDF:", number((tf_idf),
accuracy = .0001),
"<br>TF:", number((tf),
accuracy = .0001),
"<br>IDF:", number((idf),
accuracy = .0001),
"<br>Total Daily Words:", comma(total),
"<br>Daily Mentions:", n,
"<br>Date: November", tweet_day, ", 2018"
))) +
geom_col(show.legend = FALSE) +
labs(x = NULL, y = "") +
scale_fill_brewer(palette = "Paired") +
facet_wrap(~tweet_day, ncol = 3, scales = "free") +
coord_flip() +
theme(legend.position = "none") +
theme(axis.text.x = element_text(angle=15, size = 6))
ggplotly(plot_day2, tooltip = "text", width = 900, height = 550)
# layout(showlegend = FALSE, margin = list(r = 50, b = 50, l = 50))
Tokenizing with ngrams
When a word is preceded by a negating word, its meaning becomes its inverse. Let’s take a look using the “AFINN” lexicon, which scores each sentiment with different weights. Which words in the previous charts when seen in this context had an opposite meaning?
Not…
nstrom_tweets_day[] <- lapply(nstrom_tweets_day, as.character)
nstrom_bigrams <- nstrom_tweets_day %>%
unnest_tokens(bigram, stripped_text, token = "ngrams", n = 2)
bigrams_separated <- nstrom_bigrams %>%
separate(bigram, c("word1", "word2"), sep = " ")
#how often words are preceded by a word like “not”:
bigrams_separated2 <- bigrams_separated %>%
dplyr::filter(word1 == "not") %>%
dplyr::count(word1, word2, sort = TRUE)
AFINN <- get_sentiments("afinn")
#We can then examine the most frequent words that were preceded by “not” and were associated with a sentiment.
not_words <- bigrams_separated2 %>%
dplyr::filter(word1 == "not") %>%
dplyr::inner_join(AFINN, by = c(word2 = "word")) %>%
dplyr::count(word2, score, sort = TRUE) %>%
dplyr::ungroup() %>%
dplyr::rename("n" = "n")
#which words contributed the most in the “wrong” direction. To compute that, we can multiply their score by the number of times they appear (so that a word with a score of +3 occurring 10 times has as much impact as a word with a sentiment score of +1 occurring 30 times).
plot_not = not_words %>%
dplyr::mutate(contribution = n * -score) %>%
dplyr::arrange(desc(abs(contribution))) %>%
dplyr::mutate(word2 = reorder(word2, contribution)) %>%
ggplot(aes(word2, -n * score, fill = n * score > 0,
text = paste("not ", word2, "<br> Score:", -n * score))) +
scale_fill_brewer(palette = "Set2") +
geom_col(show.legend = FALSE) +
xlab("Words preceded by NOT") +
ylab("Sentiment score * number of occurrences * -1") +
coord_flip()
ggplotly(plot_not, tooltip = "text", width = 900, height = 550) %>%
layout(showlegend = FALSE, margin = list(b = 50, l = 50))
# not_words %>%
# mutate(contribution = (nn * score)) %>%
# arrange(desc(abs(contribution))) %>%
# head(20) %>%
# mutate(word2 = reorder(word2, contribution)) %>%
# ggplot(aes(word2, nn * score, fill = nn * score > 0)) +
# geom_col(show.legend = FALSE) +
# xlab("Words preceded by \"not\"") +
# ylab("Sentiment score * number of occurrences * -1") +
# coord_flip()
Note that we multiplied the sentiment score by -1 to reflect the inverse impact of the word “not.” Here is the same concept illustrated with a few more negating words:
negation_words <- c("not", "no", "never", "don't")
negated_words <- bigrams_separated %>%
dplyr::filter(word1 %in% negation_words) %>%
dplyr::inner_join(AFINN, by = c(word2 = "word")) %>%
dplyr::count(word1, word2, score, sort = TRUE) %>%
dplyr::ungroup()
plot_neg <- negated_words %>%
dplyr::mutate(contribution = n * -score) %>%
dplyr::arrange(abs(desc(contribution))) %>%
#head(30) %>%
dplyr::mutate(word2 = reorder(word2, contribution)) %>%
ggplot(aes(word2, n * -score, fill = n * score > 0,
text = paste(word1, " ", word2, "<br> Score:", -n * score))) +
scale_fill_brewer(palette = "Set2") +
theme_minimal(base_size = 9) +
geom_col(show.legend = FALSE) +
xlab("") +
ylab("Sentiment score * number of occurrences") +
facet_wrap(~word1, ncol = 2, scales = "free_y") +
coord_flip()
ggplotly(plot_neg, tooltip = "text", width = 900, height = 550) %>%
layout(showlegend = FALSE, margin(r = 20, b = 50, l = 20))
Certain adjectives and adverbs are used for emphasis – very, really, extremely, only, actually, so… etc. We can double the score of the second word score to reflect the impact from the first word.
nstrom_counts = nstrom_tweets_day %>%
unnest_tokens(word, stripped_text) %>%
dplyr::group_by(word) %>%
dplyr::summarize(n = length(word)) %>%
dplyr::arrange(desc(n)) %>%
dplyr::ungroup()
n_y = nstrom_counts %>% dplyr::filter(str_detect(word, "y$"))
emphasis_words <- c("very", "really", "extremely", "only", "actually", "so")
emphatic_words <- bigrams_separated %>%
dplyr::filter(word1 %in% emphasis_words) %>%
dplyr::inner_join(AFINN, by = c(word2 = "word")) %>%
dplyr::count(word1, word2, score, sort = TRUE) %>%
dplyr::ungroup()
plot <- emphatic_words %>%
dplyr::mutate(contribution = 2* n * score) %>%
dplyr::arrange(abs(desc(contribution))) %>%
head(50) %>%
dplyr::mutate(word2 = reorder(word2, contribution)) %>%
ggplot(aes(word2, 2 * n * score, fill = n * score > 0,
text = paste(word1, " ", word2, "<br> Score:", n * score))) +
scale_fill_brewer(palette = "Set2", direction = -1) +
theme_minimal(base_size = 9) +
geom_col(show.legend = FALSE) +
xlab("") +
ylab("Sentiment score * number of occurrences * 2") +
facet_wrap(~word1, ncol = 2, scales = "free_y") +
coord_flip()
ggplotly(plot, tooltip = "text", width = 900, height = 550) %>%
layout(showlegend = FALSE, margin = list(r = 20, b = 50, l = 80))
Network Analysis
Finally, we can visualize a network of bigrams (paired words):
bigrams_filtered <- bigrams_separated %>%
dplyr::filter(!word1 %in% stop_words$word) %>%
dplyr::filter(!word2 %in% stop_words$word)
bigram_counts <- bigrams_filtered %>%
dplyr::count(word1, word2, sort = TRUE)
library(igraph)
bigram_graph <- bigram_counts %>%
dplyr::filter(n > 50) %>%
graph_from_data_frame()
#bigram_graph
library(ggraph)
set.seed(2017)
ggraph(bigram_graph, layout = "fr") +
theme_void() +
geom_edge_link(aes(edge_alpha = 1, color = "red"), arrow = arrow(type = "closed", length=unit(.075, "inches")), show.legend = FALSE) +
geom_node_point(color = "turquoise", size = 4, alpha = .5) +
geom_node_text(aes(label = name), size = 3, vjust = 1, hjust = 1)

Thanks for reading through; this project was fascinating to work on and we look forward to applying text mining to more areas within Nordstrom.
---
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  <img src="/Users/c89v/Desktop/am2_logo.png" alt="" width=180px class="center"/>
  <a href="#about">Text Mining + Sentiment Analysis with Twitter</a>
  <a href="#top"> <font size="2" color= "#1f78b4"> top of page </font></a>
</div>

<!-- CONTENT STARTS HERE  -->

<div class="main">
<div class="body">

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, message = FALSE, warning = FALSE)
```

```{r}
# load packages, install if needed
packages = c(
      "dplyr"
    , "ggplot2"
    , "formattable"
    , "plotly"
    , "RColorBrewer"
    , "scales"
    , "stringr"
    , "tidyr"
    , "ElmeR"
    , "RJDBC"
    , "kableExtra"
    , "wesanderson"
    , "reshape2"
    , "rtweet"
    , "tidytext"
    , "lubridate"
    , "wordcloud"
    )

package.check <- lapply(packages, FUN = function(x) {
  if (!require(x, character.only = TRUE)) {
    install.packages(x, dependencies = TRUE)
    library(x, character.only = TRUE)
  }
})

options(scipen= 999)
theme_set(theme_minimal(base_size = 9, base_family = "Roboto"))

```


```{r}

# # search for all recent tweets with Nordstrom in them
# # nstrom_tweets <- search_tweets("nordstrom OR #nordstrom OR @nordstrom OR nordstrom's", n = 18000, type = "recent", lang = "en", include_rts = TRUE)
# 
# #extract text
# #nstrom_tweets$stripped_text <- gsub("http.*","",  nstrom_tweets$text)
# #nstrom_tweets$stripped_text <- gsub("https.*","", nstrom_tweets$stripped_text)
# 
# # nstrom_tweets_day <- nstrom_tweets %>%
# #   mutate(tweet_day = lubridate::day(as.Date(created_at))) %>%
# #   dplyr::select(stripped_text, tweet_day) %>%
# #   ungroup()
# 
# #remove stop words
# # nstrom_tweets_clean <- nstrom_tweets %>%
# #   mutate(tweet_day = lubridate::day(as.Date(created_at))) %>%
# #   dplyr::select(stripped_text, tweet_day) %>%
# #   ungroup() %>%

nstrom_tweets_day <- read.csv("/Users/c89v/Documents/Git/c89v_projects/q4_2018/accounts/code/nstrom_tweets.csv")

nstrom_tweets_day[] <- lapply(nstrom_tweets_day, as.character)
```

<h1 id ="top">Author: <font color="#ee8f71"><b>Jessica Marx</b></font></h1>

#Date: __<font color="#ee8f71"> 19 November 2018 </font>__

##Dataset: 
November 8-16, 2018; tweets mentioning Nordstrom (and variations).

##Jira Story: [NORDACE-8398](https://jira.nordstrom.net/browse/NORDACE-8398) 

##Code: [R](https://gitlab.nordstrom.com/nordace/digital/analytics/c89v_projects/blob/master/q4_2018/team_organization/code/twitter_text_mining.Rmd) 
##Purpose: 
The DA team recently attended an R conference, which featured several talks on Text Mining and Sentiment analysis, including one from the author of the `tidytext` package. We wanted to take what we learned and apply it with regard to Nordstrom and how the company is discussed in the Twitter-verse. 

##Methodology: 
Using the `rtweet` package, we pulled the maximum number of recent records mentioning Nordstrom (and all relevant variations -- #nordstrom, @nordstrom, etc.), including re-tweets. 

##Results: 
The following is meant to be a demonstration of the various types of text analyses that can be done with text mining and R. </p>
<p> First off, we used the `tidytext` package to separate each tweet by word, eliminate non-meaningful words (AKA "stop words"), and join words to the "Bing" sentiment lexicon. Note that "Bing" is binary -- words are classified as either "Positive" or "Negative."

```{r}

nstrom_tweets_clean <- nstrom_tweets_day %>% 
  unnest_tokens(word, stripped_text) %>%
  anti_join(stop_words) %>% 
  dplyr::mutate(tweet_day = as.integer(tweet_day)) %>% 
  dplyr::filter(!tweet_day %in% c(6, 7))

#update lexicon

nstrom_sent_bing <- nstrom_tweets_clean %>%
  inner_join(get_sentiments("bing")) %>% 
  dplyr::filter(!tweet_day %in% c(6, 7))

nstrom_sent_bing = nstrom_sent_bing %>% 
  dplyr::group_by(tweet_day, sentiment, word) %>%
  dplyr::summarize(n = length(word)) %>%
  dplyr::ungroup() %>%
  dplyr::arrange(desc(n)) %>% 
  dplyr::mutate(tweet_day = as.integer(tweet_day))

plot_a = ggplot(nstrom_sent_bing, aes(x=reorder(sentiment, n), 
                             y = n, , 
                             fill = sentiment,
                             text = paste("Date: November", tweet_day, ", 2018",
                                          "<br>Sentiment:", sentiment,
                                          "<br>Score:", n))) + 
  geom_bar(stat = "identity", position = "identity") +  
  facet_wrap(.~tweet_day) + 
  ylab("Word Count") + 
  xlab("Sentiment Counts by Day") + 
  scale_fill_brewer(palette = "Set2", name = "Sentiment", direction = -1) + 
  theme(axis.text.x = element_blank())

ggplotly(plot_a, tooltip = "text", width = 900, height = 550)

```

This seems clear enough. But what words are contributing to each sentiment?

```{r}

x = nstrom_tweets_clean$word
nstrom_words <- x
nstrom_words <- data.frame(nstrom_words)
nstrom_words[] <- lapply(nstrom_words, as.character)

tibblez = nstrom_words %>% 
  dplyr::rename(word = nstrom_words) %>%
  dplyr::group_by(word) %>%
  dplyr::summarize(n = length(word)) %>%
  dplyr::ungroup() %>%
  dplyr::arrange(desc(n))


tibblefiltered = tibblez %>% 
  dplyr::filter(n > 1)
attach(tibblefiltered)
barsentiment <- tibblefiltered %>%
  inner_join(get_sentiments("bing"), by = c("word"))

attach(barsentiment)

plot_c = barsentiment %>%
    dplyr::count(sentiment, word, n=n) %>%
    dplyr::ungroup() %>%
    dplyr::filter(n >= 35) %>%
  # filter(!word %in% ignore_words) %>%
  # filter(word != "free") %>% #doesn't need to add to weight we don't know context 
    dplyr::mutate(n = ifelse(sentiment == "negative", -n, n)) %>%
    dplyr::mutate(word = reorder(word, n)) %>%
    ggplot(aes(word, n, fill = factor(sentiment),
               text = paste("Word:", word,
                            "<br>Mentions:", n))) +
    geom_bar(stat = "identity") +
    scale_fill_brewer(palette = "Set2", name = "Sentiment", direction = -1) + 
    ylab("Contribution to sentiment") +
    xlab("Words mentioned more than 30x") + 
    coord_flip() 

ggplotly(plot_c, tooltip = "text", width = 900, height = 750)


```

Most of these words seem correctly applied to their sentiment, but a few stand out as ambiguous or misclassified: 
<ul>
  <li>free</li>
  <li>trump</li>
  <li>fall</li>
</ul>
We can remove them as neutral words (for now) and return to our charts showing sentiments by day. 

```{r}
nstrom_sent_bing2 = nstrom_sent_bing %>% 
  dplyr::filter(!word %in% c("fall", "trump", "free", "rack", "black", "puma", "credit", "money", "tree",  "pop", "hit"))

plot_b = ggplot(nstrom_sent_bing2, aes(x=reorder(sentiment, n), y = n, group = 1,
                              text = paste("Date: November", tweet_day, ", 2018",
                                          "<br>Sentiment:", sentiment,
                                          "<br>Score:", n))) + 
  geom_bar(stat = "identity", position = "identity", aes(fill = sentiment)) +
  facet_wrap(.~tweet_day) + 
  ylab("Word Count") + 
  xlab("Sentiment Counts by Day") + 
  scale_fill_brewer(palette = "Set2", direction = -1, name = "Sentiment") +  
  #scale_fill_brewer(palette = "Set2", name = "Sentiment", direction = -1) +
  theme(axis.text.x = element_blank())

ggplotly(plot_b, tooltip = "text", width = 900, height = 550)


```

We can also use the "NRC" lexicon to track additional sentiments: 

```{r}

nstrom_sent_nrc <- nstrom_tweets_clean %>%
  inner_join(get_sentiments("nrc")) %>% 
  dplyr::count(word, sentiment, sort = TRUE) %>% 
  dplyr::ungroup() %>%
  dplyr::filter(!sentiment %in% c("positive")) %>% 
  dplyr::filter(!word %in% c("fall", "trump", "free", "rack", "black", "puma", "credit", "money", "tree", "pop", "hit"))

nstrom_nrc_counts = nstrom_sent_nrc %>% 
  dplyr::group_by(sentiment) %>%
  dplyr::top_n(10) %>%
  dplyr::ungroup() %>%
  dplyr::mutate(word = reorder(word, n))

plot_d = ggplot(nstrom_nrc_counts, aes(x=reorder(word, n), y = n, fill = sentiment,
                              text = paste("Word:", word,
                                          "<br>Sentiment:", sentiment,
                                          "<br>Mentions:", n), group = 1)) + 
  geom_bar(stat = "identity") +  
  facet_wrap(.~sentiment, scales = "free_y", ncol = 3) + 
  ylab("Top 10 Words per Sentiment") + 
  xlab("") + 
  scale_fill_brewer(palette = "Paired", name = "Sentiment") +
  coord_flip() + 
  theme(axis.text.x = element_blank())

ggplotly(plot_d, tooltip = "text", width = 900, height = 550)


```

Everyone loves a __word cloud__!

```{r, message=FALSE, warning=FALSE}
 
nstrom_cloud = nstrom_tweets_clean %>% 
  anti_join(stop_words) %>%
  dplyr::ungroup() %>% 
  dplyr::filter(!word %in% c("fall", "trump", "free", "rack", "black", "puma", "credit", "money", "tree", "pop", "hit", "nordstrom")) %>%
  dplyr::count(word) %>%
  dplyr::filter(!word =="shipping") %>%
  with(wordcloud(word, n, max.words = 100))

```
##Term Frequency
We can look at term frequency by day. This just shows us that every day there are a few words that are used extremely frequently and many that are used infrequently, which intuitively makes sense. 

```{r, message=FALSE, warning=FALSE}
#term frequency

day_words <- nstrom_tweets_clean %>%
  dplyr::count(tweet_day, word, sort = TRUE) %>% 
  ungroup()

total_words <- day_words %>% 
  dplyr::group_by(tweet_day) %>% 
  dplyr::summarize(total = sum(n))

day_words <- left_join(day_words, total_words)

#let’s look at the distribution of n/total for each day, the number of times a word appears in a day divided by the total number of terms (words) in that day This is exactly what term frequency is.
plot_e = ggplot(day_words, aes(n/total, fill = factor(tweet_day),
                               text = paste("Date: November", tweet_day, ", 2018",
                                            "<br>Rank:", n,
                                            "<br>Unique Daily Words:", comma(total)))) +
  geom_histogram() +
  xlim(NA, 0.004) +  
  scale_fill_brewer(palette = "Paired", name = "Day in November 2018") + 
  theme(legend.position = "none") + 
  facet_wrap(~tweet_day, ncol = 3, scales = "free_y")

ggplotly(plot_e, tooltip = "text", width = 900, height = 550)


```
##Zipf's Law
Illustrating the relationship between the frequency that a word is used and its end rank with __Zipf’s law__ (which states that the frequency that a word appears is inversely proportional to its rank).
<br> _FYI: George Zipf was a 20th century American linguist._


```{r}

freq_by_rank <- day_words %>% 
  dplyr::group_by(tweet_day) %>% 
  dplyr::mutate(rank = row_number(), 
         `term frequency` = n/total)

freq_by_rank %>% 
  ggplot(aes(rank, `term frequency`, 
             color = factor(tweet_day))) + 
  geom_line(size = 0.5, alpha = 0.8, show.legend = FALSE) + 
  scale_color_brewer(palette = "Paired") + 
  scale_x_log10() +
  scale_y_log10() + 
  ylab("term frequency")

```

The deviations at low rank mean that people who tweet about Nordstrom use a lower percentage of the most common words than what is expected. 

Here is the same graph, but with an approximation of the slope: 

```{r}
# Let’s see what the exponent of the power law is for the middle section of the rank range.
rank_subset <- freq_by_rank %>% 
  dplyr::filter(rank < 500,
         rank > 10)

# lm(log10(`term frequency`) ~ log10(rank), data = rank_subset)

freq_by_rank %>% 
  ggplot(aes(rank, `term frequency`, color = factor(tweet_day))) + 
  geom_abline(intercept = -1.1641, slope = -0.8522, color = "black", linetype = 2) +
  scale_color_brewer(palette = "Paired") + 
  geom_line(size = 0.5, alpha = 0.8, show.legend = FALSE) + 
  scale_x_log10() +
  scale_y_log10() +
  ylab("term frequency")


```

##TF IDF
The idea of tf-idf is to find the important words -- words that stand out -- by decreasing the weight for commonly used words and increasing the weight for words that are not used very much in a collection. Calculating tf-idf attempts to find the words that are important (i.e., common) in a text, but not too common. 
<p> _November 8 - 16, 2018:_ </p>
```{r}

day_words2 <- day_words %>%
  bind_tf_idf(word, tweet_day, n) %>% 
  dplyr::arrange(desc(tf_idf))

plot_day2 = 
day_words2 %>%
  dplyr::arrange(desc(tf_idf)) %>%
  dplyr::mutate(word = factor(word, levels = rev(unique(word)))) %>% 
  dplyr::group_by(tweet_day) %>% 
  top_n(10) %>% 
  ungroup %>%
  ggplot(aes(word, tf_idf, fill = factor(tweet_day), 
             text = paste("Word:", word, 
                          "<br>TF IDF:", number((tf_idf), 
                                                       accuracy = .0001),
                          "<br>TF:", number((tf), 
                                                       accuracy = .0001),
                          "<br>IDF:", number((idf), 
                                                       accuracy = .0001),
                          "<br>Total Daily Words:", comma(total),
                          "<br>Daily Mentions:", n,
                          "<br>Date: November", tweet_day, ", 2018"
                          ))) +
  geom_col(show.legend = FALSE) +
  labs(x = NULL, y = "") +
  scale_fill_brewer(palette = "Paired") +
  facet_wrap(~tweet_day, ncol = 3, scales = "free") +
  coord_flip() + 
  theme(legend.position = "none") + 
  theme(axis.text.x = element_text(angle=15, size = 6))

ggplotly(plot_day2, tooltip = "text", width = 900, height = 550)
#   layout(showlegend = FALSE, margin = list(r = 50, b = 50, l = 50))

```

##Tokenizing with ngrams
<br>When a word is preceded by a negating word, its meaning becomes its inverse. Let's take a look using the "AFINN" lexicon, which scores each sentiment with different weights. Which words in the previous charts when seen in this context had an opposite meaning? 
<p> __Not...__ </p>


```{r}

nstrom_tweets_day[] <- lapply(nstrom_tweets_day, as.character)

nstrom_bigrams <- nstrom_tweets_day %>%
  unnest_tokens(bigram, stripped_text, token = "ngrams", n = 2)

bigrams_separated <- nstrom_bigrams %>%
  separate(bigram, c("word1", "word2"), sep = " ")

#how often words are preceded by a word like “not”:

bigrams_separated2 <- bigrams_separated %>%
  dplyr::filter(word1 == "not") %>%
  dplyr::count(word1, word2, sort = TRUE)

AFINN <- get_sentiments("afinn")

#We can then examine the most frequent words that were preceded by “not” and were associated with a sentiment.
not_words <- bigrams_separated2 %>%
  dplyr::filter(word1 == "not") %>%
  dplyr::inner_join(AFINN, by = c(word2 = "word")) %>%
  dplyr::count(word2, score, sort = TRUE) %>%
  dplyr::ungroup() %>% 
  dplyr::rename("n" = "n")

#which words contributed the most in the “wrong” direction. To compute that, we can multiply their score by the number of times they appear (so that a word with a score of +3 occurring 10 times has as much impact as a word with a sentiment score of +1 occurring 30 times). 

plot_not = not_words %>%
  dplyr::mutate(contribution = n * -score) %>%
  dplyr::arrange(desc(abs(contribution))) %>%
  dplyr::mutate(word2 = reorder(word2, contribution)) %>%
  ggplot(aes(word2, -n * score, fill = n * score > 0, 
             text = paste("not ", word2, "<br> Score:", -n * score))) +
  scale_fill_brewer(palette = "Set2") +
  geom_col(show.legend = FALSE) +
  xlab("Words preceded by NOT") +
  ylab("Sentiment score * number of occurrences * -1") +
  coord_flip()

ggplotly(plot_not, tooltip = "text", width = 900, height = 550) %>% 
  layout(showlegend = FALSE, margin = list(b = 50, l = 50))


# not_words %>%
#   mutate(contribution = (nn * score)) %>%
#   arrange(desc(abs(contribution))) %>%
#   head(20) %>%
#   mutate(word2 = reorder(word2, contribution)) %>%
#   ggplot(aes(word2, nn * score, fill = nn * score > 0)) +
#   geom_col(show.legend = FALSE) +
#   xlab("Words preceded by \"not\"") +
#   ylab("Sentiment score * number of occurrences * -1") +
#   coord_flip()


```

Note that we multiplied the sentiment score by -1 to reflect the inverse impact of the word "not." Here is the same concept illustrated with a few more negating words: 

```{r}

negation_words <- c("not", "no", "never", "don't")

negated_words <- bigrams_separated %>%
  dplyr::filter(word1 %in% negation_words) %>%
  dplyr::inner_join(AFINN, by = c(word2 = "word")) %>%
  dplyr::count(word1, word2, score, sort = TRUE) %>%
  dplyr::ungroup()

plot_neg <- negated_words %>%
  dplyr::mutate(contribution = n * -score) %>%
  dplyr::arrange(abs(desc(contribution))) %>%
  #head(30) %>%
  dplyr::mutate(word2 = reorder(word2, contribution)) %>%
  ggplot(aes(word2, n * -score, fill = n * score > 0, 
             text = paste(word1, " ", word2, "<br> Score:", -n * score))) +
  scale_fill_brewer(palette = "Set2") +
  theme_minimal(base_size = 9) +
  geom_col(show.legend = FALSE) +
  xlab("") +
  ylab("Sentiment score * number of occurrences") +
  facet_wrap(~word1, ncol = 2, scales = "free_y") + 
  coord_flip()

ggplotly(plot_neg, tooltip = "text", width = 900, height = 550) %>% 
  layout(showlegend = FALSE, margin(r = 20, b = 50, l = 20))

```

Certain adjectives and adverbs are used for emphasis -- _very, really, extremely, only, actually, so..._ etc. We can double the score of the second word score to reflect the impact from the first word.  

```{r}


nstrom_counts = nstrom_tweets_day %>% 
unnest_tokens(word, stripped_text) %>% 
dplyr::group_by(word) %>% 
dplyr::summarize(n = length(word)) %>%
dplyr::arrange(desc(n)) %>% 
dplyr::ungroup() 

n_y = nstrom_counts %>% dplyr::filter(str_detect(word, "y$"))

emphasis_words <- c("very", "really", "extremely", "only", "actually", "so")

emphatic_words <- bigrams_separated %>%
  dplyr::filter(word1 %in% emphasis_words) %>%
  dplyr::inner_join(AFINN, by = c(word2 = "word")) %>%
  dplyr::count(word1, word2, score, sort = TRUE) %>%
  dplyr::ungroup()

plot <- emphatic_words %>%
  dplyr::mutate(contribution = 2* n * score) %>%
  dplyr::arrange(abs(desc(contribution))) %>%
  head(50) %>%
  dplyr::mutate(word2 = reorder(word2, contribution)) %>%
  ggplot(aes(word2, 2 * n * score, fill = n * score > 0, 
            text = paste(word1, " ", word2, "<br> Score:", n * score))) +
  scale_fill_brewer(palette = "Set2", direction = -1) +
  theme_minimal(base_size = 9) + 
  geom_col(show.legend = FALSE) +
  xlab("") +
  ylab("Sentiment score * number of occurrences * 2") +
  facet_wrap(~word1, ncol = 2, scales = "free_y") + 
  coord_flip() 

ggplotly(plot, tooltip = "text", width = 900, height = 550) %>% 
  layout(showlegend = FALSE, margin = list(r = 20, b = 50, l = 80))


```
##Network Analysis
Finally, we can visualize a network of bigrams (paired words): 

```{r}

bigrams_filtered <- bigrams_separated %>%
  dplyr::filter(!word1 %in% stop_words$word) %>%
  dplyr::filter(!word2 %in% stop_words$word)

bigram_counts <- bigrams_filtered %>% 
  dplyr::count(word1, word2, sort = TRUE)

library(igraph)

bigram_graph <- bigram_counts %>%
  dplyr::filter(n > 50) %>%
  graph_from_data_frame()

#bigram_graph

library(ggraph)

set.seed(2017)


ggraph(bigram_graph, layout = "fr") +  
  theme_void() +   
  geom_edge_link(aes(edge_alpha = 1, color = "red"), arrow = arrow(type = "closed", length=unit(.075, "inches")), show.legend = FALSE) +  
  geom_node_point(color = "turquoise", size = 4, alpha = .5) +  
  geom_node_text(aes(label = name), size = 3, vjust = 1, hjust = 1) 

```
<p>Thanks for reading through; this project was fascinating to work on and we look forward to applying text mining to more areas within Nordstrom.</p>

